Seal for a joint or juncture – Seal between relatively movable parts – Circumferential contact seal for other than piston
Reexamination Certificate
2000-04-05
2003-09-23
Knight, Anthony (Department: 3676)
Seal for a joint or juncture
Seal between relatively movable parts
Circumferential contact seal for other than piston
C277S560000, C277S575000, C251S334000, C251S364000
Reexamination Certificate
active
06623012
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a poppet valve seal for an integrated pressure management system that manages pressure and detects leaks in a fuel system. The present invention also relates to a poppet valve seal for an integrated pressure management system that performs a leak diagnostic for the headspace in a fuel tank, a canister that collects volatile fuel vapors from the headspace, a purge valve, and all associated hoses.
BACKGROUND OF INVENTION
In a conventional pressure management system for a vehicle, fuel vapor that escapes from a fuel tank is stored in a canister. If there is a leak in the fuel tank, canister or any other component of the vapor handling system, some fuel vapor could exit through the leak to escape into the atmosphere instead of being stored in the canister. Thus, it is desirable to detect leaks.
In such conventional pressure management systems, excess fuel vapor accumulates immediately after engine shutdown, thereby creating a positive pressure in the fuel vapor management system. Thus, it is desirable to vent, or “blow-off,” through the canister, this excess fuel vapor and to facilitate vacuum generation in the fuel vapor management system. Similarly, it is desirable to relieve positive pressure during tank refueling by allowing air to exit the tank at high flow rates. This is commonly referred to as onboard refueling vapor recovery (ORVR).
SUMMARY OF THE INVENTION
A sensor or switch signals that a predetermined pressure exists. In particular, the sensor/switch signals that a predetermined vacuum exists. As it is used herein, “pressure” is measured relative to the ambient atmospheric pressure. Thus, positive pressure refers to pressure greater than the ambient atmospheric pressure and negative pressure, or “vacuum,” refers to pressure less than the ambient atmospheric pressure.
The present invention is achieved by providing a seal for a poppet valve of an integrated pressure management apparatus. The poppet valve moves between an open position permitting fluid flow through an aperture in a housing and a closed position preventing fluid flow through the aperture. The seal comprises an annular body surrounding an axis and having first and second sealing surfaces, the first sealing surface being adapted to be fixed to the housing and surround the aperture, and the second sealing surface adapted to confront the poppet valve; and an annular lip projecting from the second sealing surface and adapted to be resiliently deformed by the poppet valve at the closed position, the annular lip projecting obliquely toward the axis in the open position.
The present invention is also achieved by a valve system for controlling fluid flow through an integrated pressure management apparatus. The valve system comprises a housing having an aperture; a poppet movable along an axis with respect to the housing, the poppet being movable between an open position permitting fluid flow through the aperture and a closed position preventing fluid flow through the aperture; and a seal surrounding the aperture at an interface between the housing and the poppet in the closed position, the seal having an annular lip projecting obliquely toward the axis and the poppet.
The present invention is further achieved by a method of sealing a movable poppet valve with respect to an aperture in a housing of an integrated pressure management system. The method comprises providing a seal positioned at an interface between the poppet valve and the housing, the seal having an annular lip projecting obliquely with respect to movement of the poppet valve; and deforming the annular lip upon occluding the aperture with the poppet valve, the deforming including scraping debris off the poppet valve.
REFERENCES:
patent: 2157299 (1939-05-01), Mercier
patent: 2330881 (1943-10-01), Gora
patent: 3110502 (1963-11-01), Pagano
patent: 3129885 (1964-04-01), Freismuth
patent: 3190322 (1965-06-01), Brown
patent: 3640501 (1972-02-01), Walton
patent: 3861646 (1975-01-01), Douglas
patent: 4136854 (1979-01-01), Ehmig et al.
patent: 4164168 (1979-08-01), Tateoka
patent: 4215846 (1980-08-01), Ishizuka et al.
patent: 4240467 (1980-12-01), Blatt et al.
patent: 4474208 (1984-10-01), Looney
patent: 4518329 (1985-05-01), Weaver
patent: 4766557 (1988-08-01), Twerdochlib
patent: 4766927 (1988-08-01), Conatser
patent: 4852054 (1989-07-01), Mastandrea
patent: 4901559 (1990-02-01), Grabner
patent: 4905505 (1990-03-01), Reed
patent: 4922957 (1990-05-01), Johnson
patent: 5058232 (1991-10-01), Stohr
patent: 5096029 (1992-03-01), Bauer et al.
patent: 5263685 (1993-11-01), Winnike et al.
patent: 5273071 (1993-12-01), Oberrecht
patent: 5388613 (1995-02-01), Kruger
patent: 5437257 (1995-08-01), Giacomazzi et al.
patent: 5474050 (1995-12-01), Cook et al.
patent: 5584271 (1996-12-01), Sakata
patent: 5635630 (1997-06-01), Dawson et al.
patent: 5826566 (1998-10-01), Isobe et al.
patent: 5884609 (1999-03-01), Kawamoto et al.
patent: 5893389 (1999-04-01), Cunningham
patent: 5911209 (1999-06-01), Kouda et al.
patent: 5979869 (1999-11-01), Hiddessen
patent: 6168168 (2001-01-01), Brown
patent: 6203022 (2001-03-01), Struschka et al.
patent: 0 688 691 (1995-12-01), None
patent: WO 99/50551 (1999-07-01), None
U.S. patent appln. No. 09/893,530, Craig Weldon, filed Jun. 29, 2001.
U.S. patent appln. No. 09/893,508, Craig Weldon, filed Jun. 29, 2001.
U.S. patent appln. No. 09/543,747, Paul D. Perry et al., filed Apr. 5, 2000.
U.S. patent appln. No. 09/275,250, John E. Cook et al., filed Mar. 24, 1999.
U.S. patent appln. No. 09/165,772, John E. Cook et al., filed Oct. 2, 1998.
Nocent Dennis
Perry Paul D.
Knight Anthony
Pickard Alison K.
Siemens Canada Limited
LandOfFree
Poppet valve seat for an integrated pressure management... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Poppet valve seat for an integrated pressure management..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Poppet valve seat for an integrated pressure management... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3078112